Sistem persamaan linier dua variabel kuadrat-kuadrat x²+y²= 1 y = 3x²

(i) x² + y² = 1 
(ii) y = 3x²

(ii) substitusikan ke (i)
x² + y² = 1 
x² + 3x²  = 1
4x² = 1
x² =1/4
x1 = 1/2  atau x2 = - 1/2

y =  3x²
x1 = 1/2 , y1 =  3(1/2)² = 3(1/4) =  3/4
x2 = -1/2 , y2 = 3(-1/2)² = 3 (1/4) = 3/4

HP (x,y) = (1/2, 3/4), (-1/2, 3/4)